The only speeding ticket I have received was from being tracked from the air. They clocked me at around 122km/h. Thank goodness they didn't see me when I was passing a line of RV's at about 160.
I'm sure a few of you have seen these, but they are appropriate for the thread:
http://www.micom.net/oops/SpeedEnforcement1.jpg
http://www.micom.net/oops/SpeedEnforcement2.jpg